Quest Synergistic Magnesium 150 mg Plus Calcium And Vitamin B6
Brand: Quest · Form: TABLET [E0155] On Market
Our assessment
The evidence shows that this combination supplement provides a meaningful dose of calcium and vitamin B6 alongside magnesium, but the specific ratio and form of magnesium are not listed on the label. For most adults, this product can support bone health and nerve function, but you must be cautious about your total calcium intake from all sources to avoid exceeding safe levels [NIH ODS].
How it works
The calcium in this formula acts as a master regulator for bone mineralization, helping deposit minerals into your skeleton, and it also supports neuromuscular relaxation by aiding nerve signaling [NIH ODS]. The vitamin B6 is included to assist with the metabolism of amino acids and neurotransmitters, though the specific mechanism for the combination is not detailed in the available data.
Safety profile
The FDA has received a total of 592,059 adverse event reports across all supplement categories. For this specific product, detailed side effect data are not available. However, taking high levels of calcium from supplements can cause constipation, nausea, weight loss, extreme tiredness, and abnormal heart rhythms. High calcium intakes might also increase the risk of heart disease and prostate cancer [NIH ODS]. Additionally, calcium can reduce the absorption of medications such as bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS].
Our recommendation
We recommend you start by assessing your total daily calcium intake from food and other supplements. If you already consume dairy or fortified foods, adding this product could push your calcium intake too high. Take this supplement with food to improve absorption, and separate it from any thyroid or antibiotic medications by at least two hours [NIH ODS]. If you are unsure about your current intake, consult your healthcare provider for a personalized assessment.
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | Quest |
|---|---|
| Serving Size | |
| Contents | 90.0 Tablet(s) |
| Market Status | On Market |
How to Read This Label
Supplement labels contain several key sections regulated by the FDA:
- Serving Size — The recommended amount per dose. Always check this — some products require multiple capsules per serving.
- Amount Per Serving — Shows the quantity of each nutrient in the product, typically in IU (International Units), mg (milligrams), or mcg (micrograms).
- % Daily Value (%DV) — Indicates how much a nutrient in a serving contributes to a daily diet. 5% DV or less is low; 20% DV or more is high.
- Other Ingredients — Lists inactive ingredients like fillers, binders, and capsule materials (e.g., gelatin, cellulose, magnesium stearate).
- Suggested Use — The manufacturer's recommended directions for taking the supplement, including timing and dosage.
Source: FDA Dietary Supplement Labeling Guide